// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

import QtQuick 2.0

Item {
    id: root
    property int dynamicWidth: 10
    property int widthSignaledProperty: 20

    Rectangle {
        width: 100
        height: 50
        color: "red"
        border.color: "black"
        border.width: 5
        radius: 10
    }

    function calculateFirstFactor(seedValue) {
        var firstFactor = (0.45 * (9.3 / 3.1) - 0.90);
        firstFactor *= (1 + (0.00001 / seedValue));
        return firstFactor;
    }

    function calculateSecondFactor(seedValue) {
        var secondFactor = 0.78 * (6.3 / 2.1) - (0.39 * 4);
        secondFactor *= (1 + (0.00001 / seedValue));
        return secondFactor;
    }

    function calculateModificationTerm(seedValue) {
        var modificationTerm = (12 + (9*7) - 54 + 16 - ((root.calculateFirstFactor(seedValue + 0.3) * seedValue) / 3) + (4*root.calculateSecondFactor(seedValue+2) * seedValue * 1.33)) + (root.calculateSecondFactor(seedValue+1) * seedValue);
        modificationTerm = modificationTerm + (33/2) + 19 - (9*2) - (61*3) + 177;
        return modificationTerm;
    }

    onDynamicWidthChanged: {
        // do a bit of maths
        var firstFactor = root.calculateFirstFactor(8);
        var secondFactor = root.calculateSecondFactor(dynamicWidth / firstFactor);
        var modificationTerm = root.calculateModificationTerm(dynamicWidth / secondFactor);

        // do some regexp matching
        var someString = "This is a random string which we'll perform regular expression matching on to reduce considerably.  This is meant to be part of a complex javascript expression whose evaluation takes considerably longer than the creation cost of QScriptValue.";
        var regexpPattern = new RegExp("is", "i");
        var regexpOutputLength = 0;
        var temp = regexpPattern.exec(someString);
        while (temp == "is") {
            regexpOutputLength += 4;
            regexpOutputLength *= 2;
            temp = regexpPattern.exec(someString);
            if (regexpOutputLength > (dynamicWidth * 3)) {
                temp = "break";
            }
        }

        // spin in a for loop for a while
        var i = 0;
        var j = 0;
        var cumulativeTotal = 3;
        for (i = 20; i > 1; i--) {
            for (j = 31; j > 5; j--) {
                var branchVariable = i + j;
                if (branchVariable % 3 == 0) {
                    cumulativeTotal -= secondFactor;
                } else {
                    cumulativeTotal += firstFactor;
                }

                if (cumulativeTotal > (dynamicWidth * 50)) {
                    break;
                }
            }
        }

        // and update the property
        widthSignaledProperty = (dynamicWidth + (20/4) + 7 - 1) * modificationTerm + regexpOutputLength - (cumulativeTotal / 73);
    }
}
